diff --git a/src/binary.ts b/src/binary.ts
deleted file mode 100644
index 521508e..0000000
--- a/src/binary.ts
+++ /dev/null
@@ -1,25 +0,0 @@
-export function arrayBufferToBase64(buffer: ArrayBufferLike) {
-  if (typeof Buffer !== 'undefined') {
-    return Buffer.from(buffer).toString('base64')
-  }
-  let binary = ''
-  const bytes = new Uint8Array(buffer)
-  for (let i = 0; i < bytes.byteLength; i++) {
-    binary += String.fromCharCode(bytes[i])
-  }
-  return btoa(binary)
-}
-
-export function base64ToArrayBuffer(base64: string) {
-  if (typeof Buffer !== 'undefined') {
-    // https://nodejs.org/api/buffer.html#bufbyteoffset
-    const buf = Buffer.from(base64, 'base64')
-    return new Uint8Array(buf.buffer, buf.byteOffset, buf.length)
-  }
-  const binary = atob(base64.replace(/\s/g, ''))
-  const buffer = new Uint8Array(binary.length)
-  for (let i = 0; i < binary.length; i++) {
-    buffer[i] = binary.charCodeAt(i)
-  }
-  return buffer
-}
diff --git a/src/index.ts b/src/index.ts
index 02f4bf8..5344e27 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,5 +1,5 @@
 export * from './array'
-export * from './binary'
+export * from './types'
 export * from './misc'
 export * from './string'
 export * from './time'
diff --git a/src/misc.ts b/src/misc.ts
index e6f01ee..3cfde49 100644
--- a/src/misc.ts
+++ b/src/misc.ts
@@ -28,40 +28,6 @@ export function mapValues<U, T, K extends string>(object: Dict<T, K>, transform:
 
 export { mapValues as valueMap }
 
-export function is<K extends keyof typeof globalThis>(type: K): (value: any) => value is InstanceType<typeof globalThis[K]>
-export function is<K extends keyof typeof globalThis>(type: K, value: any): value is InstanceType<typeof globalThis[K]>
-export function is<K extends keyof typeof globalThis>(type: K, value?: any): any {
-  if (arguments.length === 1) return (value: any) => is(type, value)
-  return type in globalThis && value instanceof (globalThis[type] as any)
-    || Object.prototype.toString.call(value).slice(8, -1) === type
-}
-
-export function clone<T>(source: T): T
-export function clone(source: any) {
-  if (!source || typeof source !== 'object') return source
-  if (Array.isArray(source)) return source.map(clone)
-  if (is('Date', source)) return new Date(source.valueOf())
-  if (is('RegExp', source)) return new RegExp(source.source, source.flags)
-  return mapValues(source, clone)
-}
-
-export function deepEqual(a: any, b: any, strict?: boolean): boolean {
-  if (a === b) return true
-  if (!strict && isNullable(a) && isNullable(b)) return true
-  if (typeof a !== typeof b) return false
-  if (typeof a !== 'object') return false
-  if (!a || !b) return false
-
-  function check<T>(test: (x: any) => x is T, then: (a: T, b: T) => boolean) {
-    return test(a) ? test(b) ? then(a, b) : false : test(b) ? false : undefined
-  }
-
-  return check(Array.isArray, (a, b) => a.length === b.length && a.every((item, index) => deepEqual(item, b[index])))
-    ?? check(is('Date'), (a, b) => a.valueOf() === b.valueOf())
-    ?? check(is('RegExp'), (a, b) => a.source === b.source && a.flags === b.flags)
-    ?? Object.keys({ ...a, ...b }).every(key => deepEqual(a[key], b[key], strict))
-}
-
 export function pick<T extends object, K extends keyof T>(source: T, keys?: Iterable<K>, forced?: boolean) {
   if (!keys) return { ...source }
   const result = {} as Pick<T, K>
diff --git a/src/types.ts b/src/types.ts
new file mode 100644
index 0000000..669007b
--- /dev/null
+++ b/src/types.ts
@@ -0,0 +1,75 @@
+import { isNullable, mapValues } from './misc'
+
+export function arrayBufferToBase64(buffer: ArrayBufferLike) {
+  if (typeof Buffer !== 'undefined') {
+    return Buffer.from(buffer).toString('base64')
+  }
+  let binary = ''
+  const bytes = new Uint8Array(buffer)
+  for (let i = 0; i < bytes.byteLength; i++) {
+    binary += String.fromCharCode(bytes[i])
+  }
+  return btoa(binary)
+}
+
+export function base64ToArrayBuffer(base64: string) {
+  if (typeof Buffer !== 'undefined') {
+    // https://nodejs.org/api/buffer.html#bufbyteoffset
+    const buf = Buffer.from(base64, 'base64')
+    return new Uint8Array(buf.buffer, buf.byteOffset, buf.length)
+  }
+  const binary = atob(base64.replace(/\s/g, ''))
+  const buffer = new Uint8Array(binary.length)
+  for (let i = 0; i < binary.length; i++) {
+    buffer[i] = binary.charCodeAt(i)
+  }
+  return buffer.buffer
+}
+
+type GlobalConstructorNames = keyof {
+  [K in keyof typeof globalThis as typeof globalThis[K] extends abstract new (...args: any) => any ? K : never]: K
+}
+
+export function is<K extends GlobalConstructorNames>(type: K): (value: any) => value is InstanceType<typeof globalThis[K]>
+export function is<K extends GlobalConstructorNames>(type: K, value: any): value is InstanceType<typeof globalThis[K]>
+export function is<K extends GlobalConstructorNames>(type: K, value?: any): any {
+  if (arguments.length === 1) return (value: any) => is(type, value)
+  return type in globalThis && value instanceof (globalThis[type] as any)
+    || Object.prototype.toString.call(value).slice(8, -1) === type
+}
+
+export function isArrayBufferLike(value: any): value is ArrayBufferLike {
+  return is('ArrayBuffer', value) || is('SharedArrayBuffer', value)
+}
+
+export function isArrayBufferSource(value: any): value is ArrayBufferLike | ArrayBufferView {
+  return isArrayBufferLike(value) || ArrayBuffer.isView(value)
+}
+
+export function clone<T>(source: T): T
+export function clone(source: any) {
+  if (!source || typeof source !== 'object') return source
+  if (Array.isArray(source)) return source.map(clone)
+  if (is('Date', source)) return new Date(source.valueOf())
+  if (is('RegExp', source)) return new RegExp(source.source, source.flags)
+  if (is('ArrayBuffer', source)) return source.slice(0)
+  if (ArrayBuffer.isView(source)) return source.buffer.slice(source.byteOffset, source.byteOffset + source.byteLength)
+  return mapValues(source, clone)
+}
+
+export function deepEqual(a: any, b: any, strict?: boolean): boolean {
+  if (a === b) return true
+  if (!strict && isNullable(a) && isNullable(b)) return true
+  if (typeof a !== typeof b) return false
+  if (typeof a !== 'object') return false
+  if (!a || !b) return false
+
+  function check<T>(test: (x: any) => x is T, then: (a: T, b: T) => boolean) {
+    return test(a) ? test(b) ? then(a, b) : false : test(b) ? false : undefined
+  }
+
+  return check(Array.isArray, (a, b) => a.length === b.length && a.every((item, index) => deepEqual(item, b[index])))
+    ?? check(is('Date'), (a, b) => a.valueOf() === b.valueOf())
+    ?? check(is('RegExp'), (a, b) => a.source === b.source && a.flags === b.flags)
+    ?? Object.keys({ ...a, ...b }).every(key => deepEqual(a[key], b[key], strict))
+}